There are 2 definitions of -es in English:

-es1

suffix

1Forming plurals of nouns ending in sibilant sounds: boxes kisses
2Forming plurals of certain nouns ending in -o: potatoes heroes

Origin

variant of -s1.

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Word of the day crowdsource
Pronunciation: ˈkraʊdsɔːs
verb
obtain (information) by enlisting help of many people…

There are 2 definitions of -es in English:

-es2

suffix

Forming the third person singular of the present tense:
1In verbs ending in sibilant sounds: pushes
2In verbs ending in -o (but not -oo): goes

Origin

variant of -s2.

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Definition of -es in: