What is the origin of 'sleep tight'?
Read moreOne of the mysteries of the English language finally explained.
1Extremely bad or serious.
2Causing or likely to cause terror; sinister.
terrible twos
informal A period in a child's social development (typically around the age of two years) which is associated with very defiant or unruly behaviour.
Late Middle English (in the sense ‘causing terror’): via French from Latin terribilis, from terrere ‘frighten’.