1. Be silent
   - hush, silence, sh, shush, be quiet, whisht [UK, Ireland, dialect]

Encyclopedia: Shh

• boost
• boost up
• booster
• booster amplifier
• booster cable
• booster dose
• booster rocket
• booster shot
• booster station
• booster unit
• boot
• boot camp
• boot disk
• boot out
• boot sale
• boot-shaped
• bootblack
• bootboys
• booted
• booted armillaria
• bootee
• booth
• boothose
• bootie
• bootjack