使い分ける tsukaiwakeru
English: use properly, to use (various things) for different purposes, use (different things) according to one’s purpose
“使い分ける” is a word that does not have a literal translation in English, and the nuance might be hard to comprehend. 使う means “to use”, and 分ける means “divide”. 使い分ける means; you have multiple options (of tools or methods) and choose the one depending on the situation or usage.
日本人は敬語とタメ語を使い分ける。
Japanese people use Keigo and casual language properly according to the situation.
A: たくさんのスパイスがありますね。
B: 料理で使い分けています。
A: You have a lot of spice.
B: I use different one depending on the dish.
