research & development; R&D

(of public transportation) scheduled operation stop due to upcoming bad weather

(of public transportation) to stop operation on schedule due to upcoming bad weather

(idiomatic) to have grown tense (of a situation); to have become critical (and to be on the verge of a major upheaval)

to each his own; different strokes for different folks; there's no accounting for taste

chickens come home to roost, so you should be prepared for your curse to come back to you. Also said to admonish someone against cursing another person casually.

three-legged race / (idiomatic) cooperating and working together to accomplish a task

so many men, so many minds

human immunodeficiency virus

Ephesians