Longman Dictionary of Contemporary English homepage

Date: 1400-1500
Origin: Probably from GRUB1 2; in sense 1, probably because birds eat grubs

grub

1 noun
     
Related topics: Food, Insects
grub1
1 [uncountable] informalDF food:
Let's get some grub.
2 [countable]HBI an insect when it is in the form of a small soft white worm
Definition from the Longman Dictionary of Contemporary English
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