Aún no tenemos significados para "continue without letup".
1The firing on the house continued without letup, as it had since seven o'clock that morning.
2The faint crackling continues without letup.
3The work on the beach had continued without letup for two hours, and still the boats were unloading squid.
4The driving continues without letup.
5"And none of the heroes are suiciding like they're supposed to." The broadcasts instructing the heroes to kill themselves continued without letup.