attune /ə-tūnˈ or (US) -toonˈ/

1. To put in tune
2. To make (one's voice, song, etc) tuneful
3. To make (something) harmonize or accord
4. To accustom or acclimatize

attuneˈment noun

• underfelts
• underfinished
• under fire
• underfire
• underfired
• underfires
• underfiring
• underfish
• underfished
• underfishes
• underfishing
• underfloor
• underflow
• underflows
• underfong
• underfonged
• underfonging
• underfongs
• underfoot
• underfooted
• underfooting
• underfoots
• underframe
• underframes
• underfulfil