แอบ (àep) is a very useful Thai word that you can add before verbs to give the feeling of “secretly” or “covertly”.

For example, to secretly like someone/have a crush on someone = แอบชอบ (àep chôp). ชอบ (chôp) by itself means to like.

Let’s see some more examples:

• To sneak out, to sneak away
  แอบหนี (หนี = to flee)
  àep nĕe
  
  
• To peep, to peek, to secretly look
  แอบมอง (มอง = to look at)
  àep mong
  
  
• To stealthily go
  แอบไป (ไป = to go)
  àep bpai
  

You can make up your own examples, just add แอบ before a verb to give the feeling of doing it secretly.

Example sentences:

• I secretly gave her the book.
  ฉันแอบให้หนังสือเค้า
  chăn àep hâi năng-sĕu káo
  
  
• I eavesdropped on the conversation
  ฉันแอบฟังบทสนทนา
  chăn àep fang bòt sŏn-tá-naa
  
  
• I did it covertly
  ฉันแอบทำมัน
  chăn àep tam man
  
  
• How did you cheat on the exam? I sneakily looked at the answers.
  คุณโกงข้อสอบได้อย่างไร? ฉันแอบดูคำตอบ
  kun gohng kôr sòp dâai yàang rai · chăn àep doo kam dtòp

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I hope you now know the meaning of แอบ and how to use it to say you have secretly done something in Thai.