Elfendertigst is a nonce word from elf (“eleven”) + dertig (“thirty”), so literally meaning "at one's thirty-eleventh".
- IPA(key): /ɔp zən ɛlfɛnˈdɛrtəxst/, /ɔp zən ɛlvənˈdɛrtəxst/
Prepositional phrase
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op zijn elfendertigst
- (idiomatic) slow and steady, not rushed, taking one's time