緩める

Etymology
From.

Verb

 * 1) to loosen; to make (a knot, rope, etc) loose
 * 2)  to be off guard; to be inattentive
 * 3) to make less strict; to make less harsh
 * 4) to make the facial expression less serious/unfriendly
 * 5) to slow down
 * 6) to make less inclined/sloped
 * 1) to make the facial expression less serious/unfriendly
 * 2) to slow down
 * 3) to make less inclined/sloped
 * 1) to slow down
 * 2) to make less inclined/sloped
 * 1) to make less inclined/sloped
 * 1) to make less inclined/sloped