upsilon /ūp-sīˈlon, ŭp-, ūpˈsi- or upˈsi-/ or ypsilon /ip-sīˈlon or ipˈsi-/

1. The twentieth letter of the Greek alphabet (Υ, υ)
2. As a numeral υˈ = 400, ˌυ = 400000
3. A short-lived heavy subatomic particle produced when beryllium nuclei are bombarded with high-energy protons

• out of touch
• out-of-town
• out of training
• out of true
• out of tune
• out of use
• out of warrant
• out of whack
• out of whole cloth
• out of work
• out-of-work
• out on a limb
• out on one's ear
• out on one's feet
• out out the window
• out-over
• out-owre
• outpace
• outpaced
• outpaces
• outpacing
• out-paramour
• out-paramoured
• out-paramouring
• out-paramours