'happen'はこちらの項目にも見つかりました。
英語の見出し語に対する説明:
a matter of time
- absolute certainty
- accompany
- agitate
- await
- become of
- befall
- betide
- causative
- coincide
- coincide with
- come
- come about
- come sb's way
- come true
- don't hold your breath
- due
- effective date
- engineer
- establish
- event
- eventuality
- go down
- good feeling
- hap
- have faith
- immanent
- imminence
- imminent
- impossibility
- impossible
- incur
- inevitable
- it will be so
- judgment day
- just in case
- lie ahead
- motor
- nonoccurrence
- occur
- on the way
- overtake
- pass
- possible
- presentiment
- prime the pump
- probable
- recur
- reoccur
- repeat