Their are several tactics to exel your Call of Duty mobile skills out of which some specific sets of skills are important for specific domain of playing such as deathmatch ,domination,hardpoint ,search and destroy etc.So here we discuss some important defensive skills about the team deathmatch mode.
1)Firstly you have to be keep moving which is the most crucial in this type of gameplay.There is no meaning of being static at a certain place and then play from there(unless you play with a sniper).
2)Secondly never use heavy guns which makes your movement sloth and you are not able to flinch in case sudden attack happens on you.
3)Walk while shooting opponent to avoid getting killed fast .
4)During a 1 vs 1encounter try to slide or prone(you can do it fast even when running forward just by going back fast and then tapping the prone button)to avoid getting killed.
5)Always try to shoot from behind the walls or any object  so that during a mass encounter you kill one and then hide yourself and get back your hp and then fire again after regaining the health back.
6)Very frequently try to look backward because you never know enemy can respawn anywhere .
7)Try to avoid long roads , tunnels and alleys to avoid getting sniped .(e.g scrapyard etc.)
8)While running try to run in a zig zag motion to avoid getting killed.
9) Always try to check every corners and all the places that you feel sceptical that enemy is hiding there.
10) Try everytime to play with your friends to make a good connection so that during the un game conversation you can track enemy better .
             Hope this helps to improves your team deathmatch defensive skills .Best of luck.

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