3 sentences for 死死 (sǐ​sǐ — firmly)

1. 他被对手死死扼住了咽喉。

   tā bèi duì​shǒu sǐ​sǐ è​zhù le yān hóu.

   He was held tightly by the throat by his opponent.

   Source: Dong Chinese Dictionary

2. 他正低头解着系得死死的鞋带。

   tā zhèng dī​tóu jiě zhe jì de sǐ​sǐ de xié​dài.

   He is looking down, trying to untie his tightly knotted shoelaces.

   Source: Dong Chinese Dictionary

3. 他死死地攥着那张照片，不肯松手。

   tā sǐ​sǐ de zuàn zhe nà zhāng zhào​piàn, bù kěn sōng​shǒu.

   He gripped the photograph tightly and refused to let go.

   Source: Dong Chinese Dictionary