return to base (of soldiers, military aircraft or ships)
unconventional; eccentric; offbeat; aberrant; outlandish; crazy
live bullets; live ammunition; ball cartridge; money
unit; (musical) group; band
assistant; associate; duplicate; copy; adverb
(one's) master; Lord; the main thing; the majority
condition; assumption; intention; intent; premise (in logic)
prototype model; experimental machine
thrust; driving force; propulsion
electromagnetic induction
making practical; making useful; implementing
to gain experience; to accumulate experiences
defect; fault; flaw; deformity; deficiency; shortage
to reveal by washing the surface; to expose by washing away dirt, earth, etc.; to discover (by investigation); to bring to light; to start washing
technology; engineering; technique; skill; art; craft
essence; the best; chic; smart; considerate; understanding
guaranteed; authentic; certified
number one; first; best; most; game; round
yesterday and today; only recently; just recently; only yesterday
debut; doing something for the first time; starting anew; starting afresh
full of (e.g. mistakes); riddled with; covered all over with (blood, mud, etc.)
small fish; small fry; (a) nobody; small fry; unimportant person
to be doing; to be in the process of doing
fall; crash (e.g. aircraft)
negligence; carelessness; inattention; unpreparedness
landing; alighting; touch down
baseline design; preliminary design; basic design
mechanism; mechanics; machines; mechanic
unsteadily (e.g. on one's feet); shakily; wavering (in one's mind); unsteadily; aimlessly; unconsciously
to fall down; to drop; to be omitted; to be missing; to decrease; to sink; to fail (e.g. exam or class)