expression, adverb
fully; thoroughly; without leaving anything out
Used when something is done completely, covering every detail or using every part, often with verbs like 伝える, 使う, or 表現する.
彼は自分の考えを余すことなく話した。
He fully expressed his thoughts.
このレシピでは食材を余すことなく使います。
This recipe uses every bit of the ingredients.