to slip into; to crawl into (under); to conceal oneself (under); to sneak into; to infiltrate
suddenly; all of a sudden; quickly; emphatically; energetically
sharing a common destiny; sitting in the same boat
safety; security; safely; without incident; good health; inaction
guarantee; security; assurance; warranty
hard; solid; stiff; tight; strong; firm (not viscous or easily moved); safe
one's last moment; one's death; one's end
plotting; planning (crime, intrigue); ringleader; mastermind; leader (of a plot)
you can never be too careful; you can't be too cautious; better safe than sorry
fragment; scrap; piece; shred
to restrict; to limit; to be restricted to; to be limited to; to be best (for); to be the best plan
absolutely; completely; utterly; really; simply; only
front-facing; forward-looking; positive; constructive
negative; passive; half-hearted; unmotivated
monitoring; watching; observation; surveillance; guarding; supervision
that being the case; in that case; if that's how it's going to go
meticulous; careful; discreet; scrupulous; prudent
small point; knob; protuberance; aloneness; loneliness; solitude
to inquire (about); to enquire; to ask; to interrogate; to question intensely; to grill (someone about something)
care; precaution; guarding; caution
to cross over (e.g. mountain); to go across; to get over (e.g. hardship); to pass time (e.g. a winter); to surpass; to be better than; to move house
then; in that case; considering; if that is the case; if so
cunning and experienced in the ways of the world; crafty and worldly-wise; sly old (fox)
to strengthen; to emphasize; to emphasise
thinking (about a matter) for a long time; contemplating for a long time; lengthy consideration; pondering
some; any; in any way; of some kind; of some sort
including (all of); -wide (e.g. company-wide); with (everyone); (concerning) the entirety of; all of
rising to action; standing up against; jumping to one's feet
trial; judgement; judgment
extreme (measure, idea, etc.); radical; violent (language); strenuous (exercise, work, etc.); excessive; (physically) demanding
underwater; behind closed doors; behind the scenes; below the surface
illegal; illicit; unlawful
machinery and materials; equipment; materials for manufacturing machinery
heavy machinery; heavy equipment; heavy machine gun
underground organization; underground organisation
guerrilla; guerrilla warfare; sudden
to get burned and stuck on (e.g. rice in a pan); to become uncollectable (e.g. debt or loan); to become irrecoverable; to remain unchanged (e.g. stock market)
strengthening; intensifying; reinforcement; reinforcement
important; essential; significant; major; key; principal
approval; license; licence; permission