'twas /twoz, twəz/ (archaic or dialect) a contraction of it was

• summital
• summit conference
• summit conferences
• summiteer
• summiteers
• summitless
• summit-level
• summit-levels
• summit meeting
• summit meetings
• summitries
• summitry
• summits
• summit talks
• summon
• summonable
• summoned
• summoner
• summoners
• summoning
• summons
• summonsed
• summonses
• summonsing
• summum bonum