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From: gwyn@brl-smoke.ARPA (Doug Gwyn )
Newsgroups: comp.unix.questions
Subject: Re: troff question
Message-ID: <6656@brl-smoke.ARPA>
Date: Sun, 8-Nov-87 10:40:55 EST
Article-I.D.: brl-smok.6656
Posted: Sun Nov  8 10:40:55 1987
Date-Received: Wed, 11-Nov-87 02:35:29 EST
References: <10221@brl-adm.ARPA>
Reply-To: gwyn@brl.arpa (Doug Gwyn (VLD/VMB) <gwyn>)
Organization: Ballistic Research Lab (BRL), APG, MD.
Lines: 16

In article <10221@brl-adm.ARPA> leff%smu.csnet@RELAY.CS.NET (Laurence Leff) writes:
>The Follwing when run through nroff, produces the attached output.
>Why do I have an extra blank line between the two Testings?

Because you put it there.  Change your example to

	.de NH
	.if n \{.br
	testing
	.br\}
	..
	.NH 
	.ti +5
	Testing 2

to avoid the blank line.