1. pot; jar; vase
大きな壺が倒れて、蓋が開いた。A big jar fell over and its lid came off.
2. dice cup
男は二つのサイコロを入れた壺を振った。The man shook the dice cup with two dice in it.
3. depression; basin (e.g. of a waterfall)
4. aim; what one wants; the mark
ここでキレたら、相手の思うつぼだ。If you snap now, that's exactly what your opponent wants.
5. key point (of a conversation, etc.); essence
このレシピのつぼは火加減だ。The key point of this recipe is the heat level.
6. acupuncture point; moxibustion point; pressure point
肩こりに効くつぼを押してみた。I tried pressing a pressure point that's good for stiff shoulders.
7. point that appeals to one's sense of humor; something one finds amusing
あの芸人のギャグは私のつぼだ。That comedian's gags tickle my funny bone.
8. position on the fingerboard (of a shamisen, koto, etc.)
oft. written as ツボ
9. target (when aiming an arrow)