bipedal walking; walking on two legs
width; breadth; freedom (e.g. of thought); latitude; gap; difference (e.g. in price)
kind; variety; (biological) species; (logical) species
passing each other; missing (meeting) each other; failing to meet; (being at) cross purposes; discrepancy
gatekeeper; door guard; doorman; concierge; janitor
to go downhill; to go down a slope
recoilless rifle; recoilless gun
human power; human strength; human effort; human agency
largest class; top category
aperture; bore; calibre; caliber
smoke grenade; smoke shell
under repair; out of service
at the critical moment; when the time comes; when it's most important; when necessary; in an emergency; when push comes to shove
(providing) covering fire; supporting (backing up) someone (in a debate or argument)
ace up one's sleeve; trump card; secret skills; secret; (arch.) left hand
suicide bombing (e.g. crashing one's plane into a target); self-destruction; blowing oneself up
loading (on board); equipping; equipped (with); built-in
to blow off (strongly); to blow away; to drive away (e.g. one's worries); to dispel; to do at great speed (e.g. drive a car); to carry out (a task) very quickly
getting mixed up in; getting embroiled in; involvement; entanglement; by-blow
I'm sorry; my apologies; may I come in?; permission; leave; dismissal
small number; few; minority
construction; building; putting up; erecting; creation; formulation
slope; incline; slope (of a linear function); gradient (vector calculus)
to run through; to run past
to scatter away; to vanish
to be damaged; to receive damage
bomb blast; blast (from an explosion); shock wave
maintenance; servicing; putting in place; establishment; development
sight (e.g. of a gun); aim; alignment
(not) well; (not) properly; (not) enough; (not) sufficiently; (not) satisfactorily; (not) decently
to match (rhythm, speed, etc.); to join together; to unite; to face; to be opposite (someone); to compare; to check with
amendment; correction; revision; modification; alteration; retouching
prototype; model; pattern; archetypal
to change into; to convert to; to transform; to be reduced; to influence; to improve (someone)
to go under; to pass under; to dive (into or under the water); to evade; to get around; to survive