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

weekend

play, amuse oneself, enjoy oneself / spend one's time idle, do nothing / for an item not to be in use, be spare or idle

friend

matter of taste

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

(archaic) the portion of a feather where the quill attaches to the skin / a feather, down, plume / a wing (as of a bird, bat, insect, or airplane) / a fletching on an arrow / a shuttlecock

liked, favorite

fondness, favor, favour

freely; as much as one wants