提 (tí) is a verb meaning "to mention" or "to bring up." It is used when referring to the act of raising a topic in conversation, and frequently appears in constructions like 不能不提 (bùnéng bù tí, "can't not mention") to emphasize that something is noteworthy.
说到杭州,不能不提西湖龙井茶。
Shuōdào Hángzhōu, bù néng bù tí Xī Hú Lóngjǐng chá.
When it comes to Hangzhou, you can't not mention West Lake Longjing tea.
你刚才提的那个想法很有意思。
Nǐ gāngcái tí de nàge xiǎngfǎ hěn yǒu yìsi.
The idea you just brought up is very interesting.
她没有提这件事,我也不好意思问。
Tā méiyǒu tí zhè jiàn shì, wǒ yě bù hǎoyìsi wèn.
She didn't bring it up, and I felt too embarrassed to ask.