once; one time; exclusively; only; alone
(all) at once; at the same time; in one go; right away; in an instant
perfunctory; cursory; passing; chance (e.g. customer); transient; stray
perfunctory; going-through-the-motions-sort of (invitation, gift, etc.)
repeated reading (makes the meaning clear); reading something again and again (will lead one to realize its meaning)
natural calamity; striking phenomena in heaven and earth
honest to a fault; one's only strength being his (her) honesty; having no redeeming feature except for being honest
repeated reading makes the meaning clear; read a difficult book a hundred times