1. To a crucial degree
   "crucially important"; "crucially, he must meet us at the airport"

See also: crucial

• backslapper
• backslash
• backslide
• backslider
• backsliding
• backspace
• backspace character
• backspace key
• backspacer
• backspin
• backstabber
• backstage
• backstair
• backstairs
• backstay
• backstitch
• backstop
• backstory
• backstroke
• backstroker
• backswept
• backswimmer
• backswing
• backsword
• backtalk