How to use frame line in a sentence
At the upper left corner, the horizontal frame line thickened projects to the left.
At the upper left corner, the horizontal frame line thickened projects to the left and the vertical line projects upward.
With the right frame line split into two parts in its lower half.
With the same peculiarities, but frame line touches the lower left corner, k1 K1 h2 i4.
With an extra line outside the frame line on the right but further from it.
British Dictionary definitions for frame line
films a black horizontal bar appearing between successive picture images
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012