"Wert the mend" is not a commonly used phrase in English. However, the spelling can be explained through its IPA phonetic transcription. The first word, "wert," is pronounced /wərt/ and is the archaic second person singular past tense of "be." The second word, "the," is pronounced /ði/ and is the definite article. The final word, "mend," is pronounced /mɛnd/ and means to repair or fix. Therefore, "wert the mend" would mean "were you fixing?" in archaic English.