1. A nervous, exciting, or uncomfortable situation
   - nail biter

Derived forms: nail-biters

• oscitance
• oscitancy
• oscitant
• oscitation
• Osco-Umbrian
• oscular
• osculate
• osculating circle
• osculation
• osculator
• osculatory
• oscule
• osculum
• OSHA
• osier
• Osip Emilevich Mandelstam
• Osip Mandelstam
• Osiris
• Oslo
• Osman I
• Osmanli
• Osmanthus
• Osmanthus americanus
• Osmeridae
• Osmerus