The meaning of the phrase 'Fit as a fiddle' means -

• The meaning of the phrase 'Fit as a fiddle' means -  very healthy.
Fit as a fiddle
English Meaning: to be very healthy and strong.
Bangla Meaning: খুব ভালো অবস্থায় থাকা / সুস্থ সবল থাকা

Ex. Sentence: Though he is grown old, he is fit as a fiddle.
Bangla Meaning: যদিও সে বৃদ্ধ হয়ে গেছে, তবুও সে সুস্থ সবল আছে।

Source; Website Lecture.