כִּ֣י ׀ אֶת־עֹ֣ל סֻבֳּל֗וֹ וְאֵת֙ מַטֵּ֣ה שִׁכְמ֔וֹ שֵׁ֖בֶט הַנֹּגֵ֣שׂ בּ֑וֹ הַחִתֹּ֖תָ כְּי֥וֹם מִדְיָֽן׃
Aumentando la gente, no aumentaste la alegría. Alegraránse delante de ti como se alegran en la siega, como se gozan cuando reparten despojos.
Ibn Ezra
יֵחַת Shall be broken; comp. החתות Thou hast broken (9:3); it is Niphal, like יִמַּס (13:7) Will be melted מֵעָם By a people.9A. V. That it be not a people. Evil shall befall them by means of a people that will come against them. יֵחַת can also be Kal of a verb נחת ,פ״נ to go down, (like יִגַּשׁ he will approach; comp. תֵּחַת It comes down) (Prov. 17:9); הנחת Cause to come down (Joel 3:11), where the נ is not omitted. The meaning of יֵחַת מֵעָם is accordingly: They will go down and be no more considered as a nation.
Rashbam
החלות, as mentioned earlier in 2,25 היום הזה אחל תת פחדך, “from this day on I begin to place the fear of you, etc.” The letter ח in the word החלות is the reason why the letter ה preceding it has the vowel patach underneath it. Similar vowel patterns are observed when the letter ה precedes the letter ע, as in Isaiah 41,25 העיירתי מצפון, “I have roused him from the north.” We have the same pattern in Deuteronomy 30,19 when Moses says העידותי בכם היום, “I call as witness against you this day, etc.” Isaiah 9,3 is another example of this anomaly. When the letter following the letter ה does not belong to the group known as אחה"ע we would generally find a chataf patach under the letter ה.