1) Because of that 2) Connected with that 3) In that connection 4) Word before hangs a tale 
• (adv.) Thereabout; -- said of place, number, etc. • (adv.) Annexed to that. • (adv.) By that; by that means; in consequence of that.
There·by' adverb 1. By that; by that means; in consequence of that. « Acquaint now thyself with him, and be at peace; thereby good shall come unto thee.» Job xxii. 21. 2. Annexed to that. ' Thereby hangs a tale.' Shak. 3. Thereabou...
[adv] - by that means or because of that
adverb by that means or because of that; `He knocked over the red wine, thereby ruining the table cloth`