อม

From Proto-Tai *ʔɤmᴬ (“to hold in the mouth”). Cognate with Northern Thai ᩋᩫ᩠ᨾ, Khün ᩋᩫ᩠ᨾ, Lao ອົມ (ʼom), Lü ᦷᦁᧄ (ʼom), Shan ဢူမ် (ʼǔum), Ahom 𑜒𑜤𑜉𑜫 (ʼum), Zhuang oem, Nong Zhuang umq.

อม • (om) (abstract noun การอม)

1. to hold in the mouth (for various purposes, such as for letting the thing held dissolve in the mouth or for sucking that thing)
2. (slang) to hold inside; to keep within; to avoid showing or expressing
   • 2019 March 4, ยิ่งยศ ปัญญา, 2:24 from the start, in ใครวะเนี่ย...ใครถีบกูวะ (กรงกรรม)‎^[1], spoken by ย้อย อัศวรุ่งเรืองกิจ (ใหม่ เจริญปุระ), Bangkok: Channel 3, retrieved 29 May 2019:

     นั่งก่อน นั่งก่อน ฟังข่าวเด็ดอีเรณู อุตส่าห์อมไว้ตั้งแต่บนรถไฟ

     nâng gɔ̀ɔn · nâng gɔ̀ɔn · fang kàao dèt ii ree-nuu · ùt-sàa om wái dtâng-dtɛ̀ɛ bon rót-fai

     Sit [down] first, sit [down] first, [and] listen to [this] hot news [about] I Renu, [which] I've tried not to disclose since [we're] on the train!

3. (slang, of a feeling, emotion, condition, etc., especially an unfavorable one) to experience; to undergo; to be consumed (by)
4. (slang) to appropriate; to embezzle
5. to mix; to contain a mixture (of)

• “อม” in Thai Dictionary Project (TDP) (UC Berkeley 1964) (plus additional data from the Royal Institute of Thailand (RI) and NECTEC's LEXITRON project (LEX)). Searchable online at SEAlang.net.