สู้

Compare Lao ສູ້ (sū). This etymology is incomplete. You can help Wiktionary by elaborating on the origins of this term.

สู้ • (sûu) (abstract noun การสู้)

1. to endure, to bear; to withstand, to resist.

   สายตา

   sûu sǎai-dtaa

   to bear the sights [of ...]

   แดด

   sûu dɛ̀ɛt

   to be proof [against] sunlight

2. to struggle, as with physical force, weapon, intelligence, etc: to fight, to battle, to combat, to contend, etc.
3. to overcome; to beat; to be superior (to).
   • 2020 January 14, เจ้าแม่แคปชั่น, “พรหมลิขิตหรือจะสู้บัตรเครดิตในมือพี่”, in เจ้าแม่แคปชั่น‎^[1], เจ้าแม่แคปชั่น, retrieved 15 January 2022:

     พรหมลิขิตหรือจะบัตรเครดิตในมือพี่

     prom-lí-kìt rʉ̌ʉ jà sûu bàt-kree-dìt nai mʉʉ pîi

     [How] can the Heaven's design prevail over the credit card in my hand?

4. (auxiliary) used to indicate that doing something is more favourable.

   นิ่งดีกว่า

   sûu nîng dii gwàa

   [It is] better to be silent.

   เราไป...

   sûu rao bpai ...

   [It is better for] us to go ... / We'd [better] go ...

5. (law) to defend (a legal case) as a defendant or the like.

สู้ • (sûu)

1. against; in opposition to.

   หลังฟ้าหน้าดิน

   lǎng sûu fáa nâa sûu din

   [with one's] back against the sky [and one's] face against the ground

   • 2018 November 30, ไปเซเว่นเอาอะไรไหม๊, “เด้งสู้มือจริง ๆ เลย”, in postjung.com‎^[2], postjung.com, retrieved 15 January 2022:

     เด้งมือ

     dêng sûu mʉʉ

     [It] bounces against [my] hand.

2. (often in negation) quite; rather.

   ไม่ดี

   mâi sûu dii

   not quite good / not quite well

• → Lao: ສູ້ (sū)
• → Khmer: ស៊ូ (suu)