to strain (oneself); to bear down; to exert oneself; to put on a bold front; to make a show of strength; to swagger
colonization; colonisation
superintendent; supervisor; warden
maternity (motherhood); maternity (pregnancy); maternity dress
frontier (esp. the American frontier); frontier (of a field); forefront (of science, technology)
Appalachian mountains; Appalachians
(logical) true; regular; 10^40; ten thousand undecillion; original; positive
repayment; refund; payback
permission; approval; authorization; to permit; to authorize
type of occupation; occupational category
business; affairs; duties; work; procedure; task
on the occasion of; at the time of
the same as it was long ago; unchanged; traditional
nest; rookery; den; haunt; (spider's) web
to harm; to hurt; to injure; to fail to ...; to miss one's opportunity to ...
view; opinion; finding; findings
to lose (something); to mislay; to get rid of; to eliminate; to remove
depression; low spirits; luxuriant (of vegetation)
prejudice; bias; distorted view
racial discrimination; racism
to think of; to hit upon; to come into one's mind; to remember; to recall
easily mixed up (e.g. similar words); easily mistaken; confusingly similar; misleading; equivocal; ambiguous
smear; daub; coating over
university student; college student