着手|ちゃくしゅchakushu[1]atamadaka (head-high)

1. noun, suru verb, intransitive verbstarting work (on); setting to work (on); setting about (doing); beginning; commencing; embarking on
   彼かれはたくさんの仕事しごとに着手ちゃくしゅした。↗

   He undertook a great deal of work.
2. noun, suru verb, intransitive verb, lawcommencing (a crime)also written as 著手
3. noun, suru verb, intransitive verb, go, shogiplaying (a move)

• Synonym取り掛かるとりかかるNeutralTo get started on something, as in 「仕事に取り掛かる」. Common in speech, whereas 「着手」 is a formal Sino-Japanese word used mainly for construction projects and investigations.
• Synonym仕掛けるしかけるNeutralTo set a trap or pick a fight, as in 「罠を仕掛ける」「喧嘩を仕掛ける」. The emphasis is on actively initiating something.
• Synonym乗り出すのりだすNeutralTo set out, as in 「事業に乗り出す」. Stresses actively venturing into a new field.
• Synonym開始かいしNeutralA noun meaning the start, as in 「試合開始」. The most general term, used mainly for events and times.
• Synonym始めるはじめるNeutralTo start something, as in 「勉強を始める」. The most all-purpose native Japanese verb for beginning.
• Synonym始動しどうNeutralA noun for starting up, as in 「エンジン始動」「新体制が始動」. Stresses something beginning to run or operate.
• Synonym踏み出すふみだすNeutralTo take the first step, as in 「新しい人生に踏み出す」. Carries a tone of resolve.
• SynonymスタートNeutralA loanword meaning the start or the beginning of a race, as in 「スタートを切る」. Frequent in everyday speech.
• Synonym始業しぎょうNeutralA noun for the start of the day's work or of classes in a term or school year, as in 「始業時間」「始業式」.
• Synonym動き出すうごきだすNeutralTo start moving, as in 「計画が動き出す」. An intransitive verb stressing that something has begun to operate.
• Synonym仕掛かるしかかるNeutralMeans having started something but not yet finished it, as in 「仕掛かった仕事」. Usually seen in the form 「仕掛かり」 and is not much used.
• Synonymし始めるしはじめるNeutralTo begin doing something, as in 「掃除をし始める」. Colloquial; the focus is on the start of the action.
• SynonymやりだすNeutralTo start doing something, as in 「急に勉強をやり出す」. Colloquial and often suggests a sudden start.
• SynonymおっぱじめるCasualSlangy, rough way of launching into something with gusto, as in 「喧嘩をおっ始める」; a coarse colloquial word, far from the formal tone of 「着手」.
• Synonymやり始めるやりはじめるNeutralTo start doing something, as in 「ピアノをやり始める」. Colloquial and more casual than 「始める」.
• Related発動はつどうNeutralA noun for putting something into effect, as in 「権限を発動する」. Used mainly for legal powers and measures.
• Related発足ほっそくNeutralA noun for an organization being launched, as in 「新内閣が発足する」. Used for groups and systems getting under way.
• Related創始そうしNeutralA noun for founding something, as in 「流派を創始する」. Stresses being the first to create it.
• Related起動きどうNeutralA noun for starting up a machine or program, as in 「パソコンを起動する」.
• Antonym完了かんりょうNeutralCompletion, as in 「工事が完了する」. The opposite of 「着手」, which marks the start of work.
• Antonym終了しゅうりょうNeutralThe end or finish of something, as in 「作業終了」. The opposite of 「着手」.
• Antonym中止ちゅうしNeutralCalling off or suspending something, as in 「計画を中止する」. The opposite of pressing ahead with 「着手」.

Use 「着手」 for formally starting construction work, an investigation or a reform, as in 「工事に着手する」「改革に着手」; it is a formal Sino-Japanese word. In everyday speech say 「取り掛かる」 or 「始める」 instead. For the founding of an organization use 「発足」. The opposite of 「着手」 is 「完了」.

Usage comparisons are AI-assisted and cross-checked by multiple models; for study reference only

1. 取り掛とりかかること。
2. 犯罪はんざいの遂行すいこうに直接ちょくせつ関係かんけいある行為こういを開始かいしすること。