pep (someone/something) up

to make someone or something more active or exciting.

With her energy and enthusiasm, she may be able to pep up the company's sales.

She was always busy trying either to pep someone up or calm someone down.

• a figment of your imagination
• a figure of fun
• a fine kettle of fish
• a fine line
• a finger in every pie
• a firm hand on the tiller
• a fishing expedition
• a fish out of water
• a flash in the pan
• a flight of fancy
• a flight of fantasy
• a flight of imagination
• a flip-flop
• a fly in the ointment
• a fly on the wall
• a fool and his money are soon parted.
• a fool's errand
• a force to be reckoned with
• a foregone conclusion
• a four-letter word
• a frame of mind
• a Frankenstein's monster
• a free agent
• a free-for-all
• a free ride