ride (on) a/the wave

to become involved with and get advantages from opinions or activities which have become very common or popular.

She came to power riding on a wave of personal popularity. (often + of)

• under attack
• under belt
• under breath
• under certain circumstances
• under false pretences
• under fire
• under heel
• under lock and key
• under no circumstances
• under nose
• under own steam
• under pain of death
• under shadow
• under someone's heel
• under someone's nose
• under someone's thumb
• under something's shadow
• under something's thumb
• under the banner of
• under the banner of something
• under the circumstances
• under the counter
• under the gun
• under the influence
• under the knife