Explain/define
well up
fill up
contention
disagreement, argument, debate
erratic
consistent, regular, stable
benign
tumour, smile, humour, environment, conclusion, method, association, report
brownie points
approval for something helpful you have done
hands down
definitely, for sure
up to scratch
below standard, unacceptable
up to scratch
to be / come up to scratch
bury yourself in
to give all your attention to something
to base on, establish on, rely on, build on
imperceptible
noticeable, obvious, visible
remit
narrow/wide
to have a / no remit to do sth
be/fall outside sb's remit
be/fall within/under sb's remit
trickle down to
to start at the top of a system, organization, etc. and spread to all of it
mug up on sth
cram for, grind, study hard
prerequisite
extra, luxury, nonessential, nonnecessity
reap
the benefits, rewards, fruits of your labour, harvest
burn the candle at both ends
to work or do other things from early in the morning until late at night and so get very little rest
negligible
trivial, insignificant, unimportant, slight, hardly noticeable
indispensable
unnecessary, non-essential, superfluous
nimble
mind, fingers, feet, hands, person
nimble handling of the [issue, dilemma, problem, situation]