Correct translation of فلا بد من in context
Hello, I am trying to translate a sentence from arabic into english but i don't know how to render the expression فلا بد من in the context of this sentence. Can anyone help me?
the sentence is : كانت لا تتركه يفلت منها، فلا بد من كلمة تمسه دون أن يحس بها أحد غيره
Thank you in advance to anyone who will answer.

Question

Correct translation of فلا بد من in context
Hello, I am trying to translate a sentence from arabic into english but i don't know how to render the expression فلا بد من in the context of this sentence. Can anyone help me?
the sentence is : كانت لا تتركه يفلت منها، فلا بد من كلمة تمسه دون أن يحس بها أحد غيره 
Thank you in advance to anyone who will answer.

Answer

There will be a word touch him for sure without anyone 's feeling

لا بد It's equal -will for sure - somehow.. or -must-

Answer

you don't have to translate it literally, you can understand the sentence and put it in your way

she hadn't let him go because there was always a word that only him whom can feel it

Answer

لا بد
They are two words, 
لا means No
بُدَّ 
May mean literally Escape, 
When they come together "as they do mostly",  they mean "Must" 
لا بُدَّ أنْ / لا بُدَّ أنَّ / لا بُدَّ وأن : حتمًا أو مِن الضروريّ
Or they mean No Escape, when you talk about something should be done and you can't escape it. In another meaning "it can't be helped ".