Down

directional preposition

Turn that music down! (direction in scale)

affix

• downtown, downstairs, downstream, downwind, etc.

perfective particle

• Write that down.
• She practiced her routine until she get it down.
• The car broke down. There was a break-down in negotiations.
• He'd read it down to the footnotes¹ = il a tout lu, même les notes de bas de page

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¹ from "Nobel economist Angus Deaton on a year of political earthquake" (speaking of Obama having read the Case/Deaton study carefully) [1]

adjective

You look/sound/seem/are down. (depressed)

It's down (broken, dysfunctional, off-line, Cf. The lights went out.)

idiomatic

down with = OK with, evolution of "down" from "hip, in, etc." notion of having joined the group, being quite good friends with (down with), etc.

music

• Go down, Moses.
• etc. ^^