class; level; stratum; layer; hierarchy
floating; drifting; suspension; (arch.) wandering (about)
average; medium; mid-grade (item); regular grade; same level as; equal to
setback; failure (e.g. plans, business); frustration; discouragement
sky; the skies; high-altitude sky; upper air
video (esp. digital); video clip; animation; animated cartoon; in-betweens (animation)
through; throughout; in the course of; all over or throughout (e.g. a place)
in turns; in series; in number order; by rotation
lined curtain; opaque curtain
number of persons; personnel
watch-keeping; guard; lookout
be on your guard!; take care!
being reluctant to give out (pay, provide, etc.); giving out grudgingly
stinginess; miserliness; shabby; cheap; petty; narrow-minded
whereabouts; address; place of temporary residence
to ascertain; to make sure of; to determine; to probe; to get to the bottom (of something)
I fear that it's likely that; with all due respect
to write a few lines (to); to drop someone a line; to write a note (to)
postbox; mailbox; post; position; post (e.g. goalpost); post- (e.g. post-Cold War)
meddling; interfering; choosing to keep the drawn tile and discarding a different one
collapse; crumbling; breaking down; (radioactive) decay; disintegration
prophet; predictor; prognosticator
to pick up; to adopt (e.g. a proposal); to accept; to take away; to confiscate; to deliver (a baby)
correspondence (to); equivalence; suitability; coordination; dealing with; coping with
acting rashly; running wildly; runaway (process); reckless baserunning
to rain incessantly; to downpour
idle gossip; foolish talk; yarn
since when; from when; how long
to descend; to go down; to be handed down (of an order, judgment, etc.); to pass (of time); to surrender; to capitulate; to be less than
absolutely essential; indispensable; vital; critical
doubt; suspicion; misgivings; scruples
suddenly; abruptly; unexpectedly