使う, 遣う, つかう
Conjugated: 使われている
Godan verb, Transitive
1. to use (a tool, method, etc.), to make use of, to put to use
2. to use (a person, animal, puppet, etc.), to employ, to handle, to manage, to manipulate
3. to use (time, money, etc.), to spend, to consume
4. to use (language), to speak
お湯を全部使わないで。