** OT : awk works only for first line

   I am trying awk to get the first word from each line in a file : I am doing :

BEGIN {   FS=":"

}

{print $1}

For the first line : it prints the first work. For other lines it prints other words also. I tried to put in FS as space but that did not help. Can someone help? I did try google but could only find example like above. Thanks for help.       

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