A 'separable affix' is an
affix that can be detached from the word it attaches to and located elsewhere in the sentence in a certain situation.
German is well known for having many separable affixes. In the sentence "Ich 'komme' gut zu Hause 'an'," the
prefix ''an'' in the verb ''ankommen'' is detached.
See also
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Separable verb
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Clitic