to decide to do something: to do something on purpose / to perform a maneuver, to carry out a tactical action / to decide on an opinion: to believe in an opinion firmly

let something grow long / straighten out / expand, extend, increase / spread

he / distal demonstrative, something far off removed from both speaker and listener: that / boyfriend

distal demonstrative, something far off removed from both speaker and listener: that, yon / particularly, male personal third person pronoun: he / by extension from he: boyfriend

he; boyfriend

hair on the head

hair

(idiomatic) to make up one’s mind, to decide

to stretch one's legs out / (figuratively) to reach one's destination and then proceed to go further

(idiomatic) to let your hair down; to have fun after a period of work or stress