with garble, as a verb, you can easily see the (enantiodromic) change taking place in its senses, to wit:

†1. trans. To remove the garble or refuse from (spice, etc.); to sift, cleanse (const. of); also, to sift out. Obs.

2. To select or sort out the best in (any thing or set of things); to take the pick of. Now rare exc. in to garble the coinage. Also with out.

†b. esp. To ‘sift’ or ‘weed’ (an army, corporation, etc.) so as to exclude unfit or uncompliant members. Also to garble out: to remove (objectionable persons) after selection. Obs.

3. To make selections from with a (usually unfair or mischievous) purpose; to mutilate (a statement, writing, etc.) with a view to misrepresentation.

¶4. Confused with garbage v. = garbage v. 1.