also: てがすく
expression, godan verb (-ku)
Idiomatic expression meaning one's hands are free, i.e., one has time or is not busy. Often used when a task is finished or when offering help.
Antonyms: 手が塞がる
今、手が空いているので、手伝いましょうか。
I'm free now, so shall I help you?
I'll be free once this work is done.