indispensable; essential; requisite; required; compulsory; necessary
riddle; puzzle; enigma; enigmatic; mysterious
bird; bird meat (esp. chicken meat); fowl; poultry
travelling clothes; traveling clothes; travelling outfit; traveling outfit
to let fly; to make fly; to skip over; to leave out; to run fast; to drive fast; to spray
off the top of one's head; from thin air; from memory
to take advantage (e.g. of a weak situation); to size up (e.g. customer when setting a high price)
(a) principle; (a) reason; (a) point; some truth
hypothesis; supposition; assumption; tentative theory
to (finally) arrive at; to reach (at last); to (manage to) get to; to find one's way to
in the ground; in the earth; underground; subterranean
horse gait; way of walking (e.g. in martial arts, etc.)
to put together; to combine; to join together; to match against (e.g. in a sport)
to speak; to say; to vocalize
feeble joke; poor joke; corny joke; bad pun
senior pupil (of the same master); senior disciple; senior student; senior member
to compete (with each other); to contend for; to vie for; to rival
under one's arm; (in) the armpit
leaving behind; desertion; abandonment
silencing (a machine, gun, etc.); muffling; muting (e.g. a TV)
to deny; to contradict; to negate (esp. a sound); to drown out
to some extent; to a certain extent
gravity; gravitation; gravitational pull
to step forward; to step forth; to advance; to start; to embark on; to set forth on
footprints; record of page visitors (e.g. in social networking sites)
ghost; spirit; apparition; spiritual body; causal body
to inform; to give notice; to tell in advance; to ask for permission (before doing something); to ask first
the same; the said; likewise
sanity; consciousness; soberness
squad leader; divisional officer
one o'clock; once; at one time; for a time; for a while; a time
evacuation; withdrawal; revocation; repeal; retreat
convenient; handy; useful
refreshing; exhilarating; invigorating; bracing
right arm; right-hand man; right hand; right-handed pitcher
don't worry; there's no need to worry
all one's power (strength, energy, efforts); one's utmost
mixed with; mingled with; interspersed with; dashed with; sprinkled with
wind; breeze; manner; behaviour; cold; influenza