1 low

2 beneath

3 to lower (one's head)

4 to let droop

5 to hang down

6 to incline

1 low pitch

2 quiet (voice)

3 subdued

4 low-key

5 low-profile

1 heavy

2 hard

3 serious

4 critical

1 taciturn

2 uncommunicative

3 silent

1 to reduce

2 to lower

3 to bring down

1 lit. to fight it out with sb to see who is best (idiom)

2 fig. to cross swords with

3 to lock horns

1 can't recognize tall or short (idiom); doesn't know what's what

1 man seeks his way up just as water seeks its way down (idiom)

2 one should constantly strive to make progress

1 in a whisper

2 in a low voice (idiom)

1 to be fawningly submissive (idiom)