手足となる (てあしとなる) Japanese meaning | KotomoraMeanings
1
expression, godan verb (-ru)
serve loyally; wait on hand and foot; be at someone's beck and call
idiomatic expression
Idiomatic expression meaning to act as someone's devoted helper, doing whatever they need. The reading しゅそくとなる is rare and literary.
書
は
上
司
の
手
足
と
なっ
て
動
く
。
The secretary acts at the boss's beck and call.