From Longman Dictionary of Contemporary Englishnot know whether to laugh or crynot know whether to laugh or cryUPSETANNOYto feel upset or annoyed about something bad that has happened, but also able to see that there is something funny about it And when I couldn’t find the passports – honestly, I didn’t know whether to laugh or cry! → laugh
Examples from the Corpus
not know whether to laugh or cry• When the whole cake fell off the table, I didn't know whether to laugh or cry. 