iron wall; impregnable fortress; impregnable; invulnerable; unassailable
self-control; self-restraint
worry; care; anxiety; mental exhaustion
secret; secrecy; mystery; secret (e.g. to success); esoteric teachings
just before; on the verge of; on the brink of; just in front of; just ahead of
to avoid meeting someone's gaze; to not look someone in the eyes
to reward; to recompense; to repay; to retaliate; to get revenge
to live; to make a living; to get on with
to lend an ear to; to listen to
again (and again); once again; yet again
to pitch in and help; to give someone a hand
to unite; to join; to do together; to confuse with
instruction in the ways of love
pleasant feeling; good vibes
graduation ceremony; commencement
instant; moment; (split) second; (in a) flash; (in the) blink of an eye
just now; a little while back; a short time ago
robust; brawny; muscular; strong; sturdy
gatekeeper; door guard; doorman; concierge; janitor
several times; a few times
to flash (e.g. lightning); to flicker; to flutter (e.g. flag); to wave; to flash into one's mind (e.g. an idea); to come to one suddenly
to go upstream; to go back (in time, to origin); to date back to; to trace back to
to re-examine; to review; to recheck
one (esp. of two); the other; on the one hand; on the other hand; whereas; although
defense; defence; guard; policing; security
throwing in; inserting; investment; commitment (of funds, personnel, etc.); launching (a product into the market); introduction
turning another away at the gate or front door; refusing to receive a caller
insipid; flat; dull; lifeless; listless
to call out to; to hail; to address; to appeal
to name; to call; to christen; to term
mobile telephone; cellular telephone